This investigation is aimed at an experimental determination of the unsteady flowfield downstream of a transonic high pressure turbine stage. The single stage measurements, which were part of a joined European project, were conducted in the windtunnel for rotating cascades of the DLR Go¨ttingen. Laser-2-focus (L2F) measurements were carried out in order to determine the Mach number, flow angle, and turbulence distributions. Furthermore, a fast response pitot probe was utilized to determine the total pressure distribution. The measurement position for both systems was 0.5 axial rotor chord downstream of the rotor trailing edge at midspan. While the measurement position remained fixed, the nozzle guide vane (NGV) was “clocked” to 12 positions covering one NGV pitch. The periodic fluctuations of the total pressure downstream of the turbine stage indicate that the NGV wake damps the total pressure fluctuations caused by the rotor wakes. Furthermore, the random fluctuations are significantly lower in the NGV wake affected region. Similar conclusions were drawn from the L2F turbulence data. Since the location of the interaction between NGV wake and rotor wake is determined by the NGV position, the described effects are potential causes for the benefits of “stator clocking” which have been observed by many researchers.
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July 2001
Technical Papers
Some Aspects of Wake-Wake Interactions Regarding Turbine Stator Clocking
Maik Tiedemann,
Maik Tiedemann
Institute of Propulsion Technology, German Aerospace Center (DLR), Go¨ttingen, Germany
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Friedrich Kost
Friedrich Kost
Institute of Propulsion Technology, German Aerospace Center (DLR), Go¨ttingen, Germany
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Maik Tiedemann
Institute of Propulsion Technology, German Aerospace Center (DLR), Go¨ttingen, Germany
Friedrich Kost
Institute of Propulsion Technology, German Aerospace Center (DLR), Go¨ttingen, Germany
Contributed by the International Gas Turbine Institute and presented at the 45th International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000. Manuscript received by the International Gas Turbine Institute February 2000. Paper No. 2000-GT-487. Review Chair: D. Ballal.
J. Turbomach. Jul 2001, 123(3): 526-533 (8 pages)
Published Online: February 1, 2000
Article history
Received:
February 1, 2000
Citation
Tiedemann , M., and Kost, F. (February 1, 2000). "Some Aspects of Wake-Wake Interactions Regarding Turbine Stator Clocking ." ASME. J. Turbomach. July 2001; 123(3): 526–533. https://doi.org/10.1115/1.1370158
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